@KitFox: Indeed, 44900 "Life is but a dream" is closed as a duplicate of 9235 "Known but to God". But I don't think they are really duplicates, as in "but a dream" it seems that "but" is acting as a preposition, while in "but to God" it is an adverb. 44900 has answers that seem more relevant to this question, so I cited it.
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Nate EldredgeDec 31 '12 at 17:28

@AndrewLeach Given that comments are temporary, it's not sufficient to point to another question as a dupe on the strength of comments. I'm not saying that's what you are doing necessarily – it may be a dupe of that question anyway.
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MετάEdDec 31 '12 at 21:57